Galvanized Fittings

Galvanized Plugs and Caps

A galvanized plug is a zinc-coated malleable cast iron fitting with a male thread that closes the female-threaded ports of galvanized fittings and water line equipment. Zinc protection continues at the closed point.

Sprinkler line ends, spare manifold outlets and unused ports on tanks and filters are the main applications. It is supplied in 10 sizes from 3/8″ to 4″.

3/8″ – 4″size range (product range)

10 sizessizes in stock

R male threadISO 7-1 taper

25 barat −20 … +120 °C (EN 10242)

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Main Applications

Closing sprinkler and branch line ends
Spare outlets of water manifolds
Unused ports on tanks, filters and booster sets
Line ends during pressure testing
Outlets to be opened later in irrigation lines
Drain and air release ports

Technical Data

Fitting type	Male-threaded plug
Product standard	TS EN 10242, design symbol A (manufacturer information)
Material	Malleable cast iron (depending on model)
Coating	Hot-dip galvanized
Coating mass	Average at least 500 g/m² (sales sheet information)
Thread	ISO 7-1 R taper male thread
Sizes	3/8″, 1/2″, 3/4″, 1″, 1 1/4″, 1 1/2″, 2″, 2 1/2″, 3″, 4″ (product range)
Permissible pressure	25 bar, −20 … +120 °C (EN 10242, design A)
Leak test	At least 5 bar air or 20 bar water (sales sheet information)
Port closed	Rp female-threaded fitting or equipment port
Head	Wrench head (depending on model)
Installation	Thread sealing tape, hemp or anaerobic sealant

Material Options

Part	Galvanized malleable iron	Black malleable iron	Stainless steel
Body	Malleable iron EN-GJMB-350-10 (depending on model)	Blackheart malleable cast iron B 350-10	Investment casting or bar, depending on model
Surface	Hot-dip zinc	Black, uncoated	Stainless, uncoated
Thread	ISO 7-1 R male thread	ISO 7-1 R male thread	Depending on model
Pressure rating	25 bar −20…120 °C (EN 10242)	25 bar −20…120 °C, 20 bar 300 °C (EN 10242)	Depending on model
Suitable media	Cold domestic water, fire and irrigation water	Closed heating water, gas, compressed air	Corrosive media and media requiring hygiene

Which material? On galvanized water and sprinkler lines a galvanized plug keeps the coated surface intact at the closed point; black plugs are used on black lines.

Advantages

Durable in Wet Conditions

The zinc coating protects the plug surface against water

Ready for Expansion

Spare outlets are used by removing the plug

Practical for Testing

Line ends are closed quickly during pressure tests

10 Sizes

From 3/8″ to 4″

Construction and Design Features

Body with ISO 7-1 R taper male thread
Head for tightening with a wrench (depending on model)
Hot-dip zinc-coated surface
TS EN 10242 design A

Send the size of the port to be closed and the quantity; we will confirm galvanized plugs from stock right away.

How to Choose?

Check the port typeA plug is for female ports; a male pipe end needs a cap.
Measure the sizeDetermine the female thread size of the port in inches.
Decide permanent or temporaryUse an easily removable sealing material on ends to be opened later.
Confirm the mediumChoose galvanized plugs on water and sprinkler lines.